Suction device for vacuum cleaners



June 17, '1941. w; E T E S 2,245,989

, SUCTION DEVICE FOR VACUUM CLEANERS Filed July 27, 1939 clean s.

, unit flexibly and pendantly in the vertical-' isspeedin an axial direction. Air thrown from- Patented June 17, 1941 I. I I

UNITED STATES PATENT OFFICE 2,245,989 1 sucrros nsvrcn son vacuum {cinemas Ward Leathers, Brooklyn, N. r..- alsignor to uadrex Corporation, New Iork, N. Y. Application July 27,1939, Serial so. zsasaz 4 aims. (Cl. 230-111) This invention relatesto improvements in vacappended drawing of which l ig. 1 is a partiallyuum,cleaners, but more particularly to the cansectioned elevation of a motor-'blower-unit inister-type machine wherein all the cleaning is corporating the principlesof nrv invention.

done through a cleaning hose. It has a special Fig. 2 is a diagrammatic plan-view of the reapplicationto the vertical-axis canister-type action blade ring. cleaner wherein th motor-suction-unit may be Fla. 3 is a partial perspective. of-same. suspended, as herein described, in a ilexible, Fig. 4 isthe same as I-ig.'3 slightly modified. pendant manner for the purpose of reducing vi- A motor-suction-unit, being generally desigbration and hence the noises due thereto. nated as I, comprises a motor 2, supported by An object of the invention is to produce a a plurality of arms 3,- adapted to drive aconical higher suction for cleaning purposes than is centrifugal fan 4 in a clock-wise direction (seen obtainable with the single-stage centrifugal fan fromthe hub). A lower fan case I surrounding common to bag-type vacuum cleaners, and to fan 4 is joined to an upper case I at a peripheral impel a much larger volume of air for cleaning juncture l. Ring-member '8' comprising a full purposes than is possible with the'multiple-stage l5 circuit of, ilired reaction blades I ls shown centrgugal compressor common to canister-type clamped between the two casemembers at the juncture I. Ring member I has an inner flange A further object of the invention is to obtain I0, for holding it stiiily in shape although it is the substantial equivalent of a double-stage cenmuch lanced or perforated for turning integral trifugal compressor in a manner free from blades I therefrom. The ring I is disposed imisiren-sounds. mediately above the tips of the blades of the fan A still further object of the invention .is to 4 and the reaction blades 9 are so bent that they reduce noise by suspending the motor-suconwill deflect air leaving the fan 4 at high rotary type canister vacuum cleaner. the tips of fan 4 attains its kineticenergy from An additional object is to obtain thehighest the high speed rotation of the fan and" after suction-volume ratio whereby when the cleaning passing through the slots l2 finds itself so nozzle. is used in a highly restrictive manner, trapped that it can not readily return to thefan such as when deeply imbedded in napped surchamber. In this manner recirculation of air, faces, the suction will be relatively high, and .30 so prevalent with the type of single-stage rotary the volume will be relatively high. This combireduced without in any way choking or impeding nation is particularly desirable in machines for the relatively high volume pertaining to this domestic use wherein motive powers and motor type of compressor. weights must be much more restricted than with It shOIJJd be noted that vthe centrifugal fan in machines for industrial cleaning purposes. How-- conical form enables the turning, of the air at ever, a conical fan together with auxiliary refan tip speed through 90 to. its centrifugal action blades, as shown herein, yields enormousthrow. This type fan turns the air in this manly increased a'i'row over the multiple-stage ce n-- ner with little or no loss in efllciency and. while triiusal unit of similar slower when applied to 40 it is being so turned it is passed through a ring portable industrial cleaners. oi reaction blades somewhat analogous to the Other objects and advantages will be more parblades 'of a turbine wherein a motive-fluid moves ticularly pointed out hereinafter or will become axially instead of radially, spirally or helically. apparent as the description proceeds. Support arms 3 of the motor-unit 2 are Joined In the accompanying drawing in which like to the upper case I and there through to a flexreference numerals designate similar parts ible mounting structure lfwhich consists of an throughout there is illustrated a suitable, 'meinner and outer metal portion between which chanical embodiment of what is now 'considsponge-rubber has been vulcanized in such a ered to be a desirable form of the invention.- manner that the vulcanized rubberadheres to The drawing is, however, for the purpose of 0 the metal; 'a process depending primarily upon I illustration onlyand not to be taken as limi ingabsolutely clean metal. brass-plated. The the invention, the scope of which is to bemeasmounting structure II is again Joined as by ured by the scope of the appended claims. screws to the outer case 18 of the vacuum I have in this specification set forth my incleaner. This top support providing a center or 'vention, and for its complete understanding have avity much below the point of support, pro- 2, and a perspective duces a slightly pendulous effect. It permits slight unbalances at high rotary speeds to lose their vibratory characteristics in gyrating action, the speedof which is a multiple inherent treme silence.

An internalblade 20 on the fan 4 produces internal circulation of air for motor cooling. I The vertical-axis canister-type machine shown in Fig. 2 shows a highly suitable installation of the unit shownin Fig. 1. Nevertheless, the conical fan and reaction-turbine-blade-ring of Figures 1, 2, 3 and 4 may be mounted and operated successfully on a horizontal axis.

In a form preferred for its simplicity of construction the blades 9 are made integral with the ring member 8. This ring of blades may be formed by lancing from the metal sheet of which the entire part is composed. Suitable schematic form for apattern is shown in Fig. I of a portion of the ring made from that pattern is shown in Fig. 3 with the bladeslanced and turned to final form. The blades 9 are so shaped that when turned to the most efilcient form for air-deflecting purposes (as suggested in Fig. 3), the outside edge A modification of the ring-member 8, shown in Fig. 4 consists of disposing the slicing edge 21 diagonally to the air stream, as in Fig. 2, but

diagonally in the opposite direction to the air stream.

I claim: a

1. In a vacuum-cleaner, a motor-suctlon-unit comprising a-cone-shaped centrifugal fan adapted to be rotated by a co-axial motor, a coneshaped casing surrounding said fan and means of deflecting air away from the tips of the blades of said fan in an axial direction for purposes 25 of the blade fits snugly against the side wall of the upper fan-casing 6. The other side wall leaves its corresponding edge 21 in a horizontal plane but diagonal to the direction of motion of the tip of the blades of blower-fan 4. The object of this diagonal slicing of the high-speed compressed-air at the point of contact with the edge 21 is to lessen siren-sounds caused by too sharp interruption of the air where the cutting edge 21 is radial to blower-fan l. It should be noted that the air delivered by the blower-fan is very dense against the inner wall of the case members 5 and 6 at their point of juncture which is adjacent the tip of the blades of-the blower-fan. The blades 9, therefore, do their major air deflecting at their outer tips and hence their greater deflection is at their greatest radius.

of decreasing recirculation, said means comprising a plurality of fixed deflector blades disposed adjacent said tips, in a ring surrounding the said mrotor J and co-axial therewith, with the entering edge of said fixed blades substantially in a plane at right-angles to the motor-axis and having their entering edges disposed diagonally to the wind stream.

2. The device described in claim 1, further characterized by having the said ring joined to the said cone-shaped casing at a point approximating its greatest diameter.

3. The device described in claim 1, further characterized by having an opening between the said ring and the motor permitting communication from a chamber above the said blades to a space back of the cone of the-said cone-shaped fan for purposes of ventilating the said motor.

4. In a vacuum-cleaner, a motor-suctlon-unit comprising a cone-shaped centrifugal fan adapted to be rotated by a co-axi'al motor, a coneshaped casing surrounding said fan and means of deflecting air away from the tips of the blades of said fan in an axial direction for purposes of decreasing recirculation, said means comprising a plurality of fixed deflector blades disposed adjacent said tips, in a ring surrounding the said motor'and co-axial therewith, and with the entering edge of said fixed blades substantially in a plane at right-angles to the motor-axis.

WARD LEATHERS. 

